Integrin alpha-M (ITAM, ITGAM, CD11b, MAC-1 alpha subunit, CR3 alpha chain) belongs to integrin alpha chain family and it is predominately presented in human myeloid cells, NK1 cells, monocytes, and granulocytes. The alpha subunit of ITAM/beta-2 complex (CD11b/CD18, Mac-1), is complex is a receptor for fibrinogen (binding to P1 and P1 peptides of gamma chain), factor X, and ICAM1. ITAM/beta-2 is implicated in adhesive interactions of monocytes, macrophages, and granulocytes. It is also linked to mediation of complement-coated particle uptake (2).